A study published by the Health Impact Institute (HEI) of the Global Air Initiative states that Delhi continues to rank the world's most polluted cities in terms of population-weighted average annual concentrations of PM2.5. Another city in the west of India, Kolkata, ranked second in the list of the most polluted cities in the world. Meanwhile, Mumbai is the 14th most polluted city in the world. According to the City Air Pollution and Health Report, the city of Kano in Nigeria is ranked third and Lima in Peru is fourth. Dhaka, Bangladesh, and Jakarta, Indonesia came in fifth and sixth respectively. In addition to India, the list of the 20 most polluted cities in the world includes three Chinese cities (Beijing, Shanghai and Chengdu). Two cities in India have official ground air su...
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